Turn off your psp (completely off, not in sleep mode). When you turn it back on hold the r trigger. This will bring you into recovery mode. go to configurations and make sure no-umd is disabled. exit from your recovery menu. Put a game or game demo into your umd tray and then try running your games.

wow. theres ur problem.
u need custom firmware or 1.50 to run homebrew. and, theres NO way to downgrade a 3.51 psp, nor is it likely there will ever be a way. u r screwed.

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thats a load of rubbish yh ok u cant down grade it but i no a way to fix it...shut dwn ur psp,reboot it n hold the r trigger this wil ltake u to the recorvery menu,go advanced>advanced>disable all 3 from umd discs,disable all then enable middle 1 for iso games,im working on a way to fix this problem to play iso and umd il get bak to you